Sample Storage Time  Cultural appearancesonMacConkey Agar Biochemical Test Inference
A,B,C &D 0 day Nil nil nil
A,B,C &D 2weeks Pinkish or golden (pink, orange, yellow or creamy white) small medium size colonies. Catalase-positive
Coagulase-positive
Staphylococcus aureus
A,B,C &D 4 weeks Pinkish or golden (pink, orange, yellow or creamy white) small medium size colonies.   Gram positive spherical cocci with single or pairing
cooci in short chains, non sporing, non-motile and non-capsulated.
Staphylococcus aureus
A,B,C&D 6 weeks Late lactose fermenters,
mucoid colonies
Non motile, Sugars (Glucose, Lactose, Sucrose and Manitol)
Indole test negative
Gram negative short rods/ bacilli
Klebsiellaspp.
Suspected
KlebsiellaaeroginosesorKlebsiellapneumoniae
Table 5: Isolation and Identification of microorganisms from samples at 0, 2,4,6 wks of storage.